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Form 10-K/A


Amendment No. 1


ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)


OF THE SECURITIES EXCHANGE ACT OF 1934


For the fiscal year ended December 31, 2004


Commission file number 1-10351





Potash Corporation of Saskatchewan Inc.


(Exact name of the registrant as specified in its charter)


|                                                                         |  |                                            
|------------------------------------------------------------------------ |  | -------------------------------------------
|Canada(State or other jurisdiction of
    incorporation or organization) |  | N/A(I.R.S. employer
    identification no.)

122  1st Avenue South


Saskatoon, Saskatchewan, Canada S7K 7G3


306-933-8500


(Address and telephone number of the registrants
principal executive offices)


Securities registered pursuant to Section 12(b) of the
Act:


|                            |  |                                     
|--------------------------- |  | ------------------------------------
|Title of each class         |  | Name of exchange on which registered
|                            |  |                                     
|Common Shares, No Par Value |  | New York Stock Exchange             



Securities registered pursuant to Section 12(g) of the
Act: none


x o


x


x o














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|                                      |  |  |  |  |  |  |  | 
|------------------------------------- |  |  |  |  |  |  |  | 
|Explanatory Note                     
|PART III                             
|SIGNATURES                           
|EXHIBIT INDEX                        
|Certification Pursuant to Section 302
|Certification Pursuant to Section 302
|Certification Pursuant to Section 906



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Explanatory Note




2



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PART III




|         |                                                
|-------- | -----------------------------------------------
|ITEM 13. | Certain Relationships and Related Transactions.





III-1



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SIGNATURES






| |                                        
| | ---------------------------------------
| | POTASH CORPORATION OF SASKATCHEWAN INC.



| |     |                                                                                                                                                                    
| | --- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | By: | /s/ WILLIAM J.
    DOYLE 
     ____________________________________________ 
     William J. Doyle 
     President and Chief Executive Officer 
     April 22, 2005



|                                             |  |                                                                                                               |  |                |  | 
|-------------------------------------------- |  | ------------------------------------------------------------------------------------------------------------- |  | -------------- |  | 
|Signature                                    |  | Title                                                                                                         |  | Date          
|                                             |  |                                                                                                               |  |               
|                                            
|/s/ DALLAS J. HOWEDallas
    J. Howe         |  | Chair of the Board                                                                                            |  | April 22, 2005
|                                            
|/s/ WAYNE R. BROWNLEEWayne
    R. Brownlee   |  | Senior Vice President, Treasurer and Chief Financial Officer
    (Principal financial and accounting officer) |  | April 22, 2005
|                                            
|/s/ WILLIAM J. DOYLEWilliam
    J. Doyle     |  | President and Chief Executive Officer                                                                         |  | April 22, 2005
|                                            
|/s/ FREDERICK J. BLESIFrederick
    J. Blesi |  | Director                                                                                                      |  | April 22, 2005
|                                            
|John
    W. Estey                            |  | Director                                                                                                      |  |               
|                                            
|/s/ WADE
    FETZER IIIWade
    Fetzer III   |  | Director                                                                                                      |  | April 22, 2005
|                                            
|/s/ ALICE D. LABERGEAlice
    D. Laberge     |  | Director                                                                                                      |  | April 22, 2005
|                                            
|/s/ JEFFREY J. MCCAIGJeffrey
    J. McCaig   |  | Director                                                                                                      |  | April 22, 2005
|                                            
|/s/ MARY MOGFORDMary
    Mogford             |  | Director                                                                                                      |  | April 22, 2005
|                                            
|/s/ PAUL J. SCHOENHALSPaul
    J. Schoenhals |  | Director                                                                                                      |  | April 22, 2005



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|                                                               |  |          |  |                |  | 
|-------------------------------------------------------------- |  | -------- |  | -------------- |  | 
|Signature                                                      |  | Title    |  | Date          
|                                                               |  |          |  |               
|                                                              
|/s/ E. ROBERT
    STROMBERG, Q.C.E.
    Robert Stromberg, Q.C. |  | Director |  | April 22, 2005
|                                                              
|/s/ JACK G. VICQJack
    G. Vicq                               |  | Director |  | April 22, 2005
|                                                              
|Elena
    Viyella de Paliza                                    |  | Director |  |               



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EXHIBIT INDEX


|            |  |                                                                             
|----------- |  | ----------------------------------------------------------------------------
|Exhibit No. |  | Description of Exhibit                                                      
|            |  |                                                                             
|31(a)       |  | Certification pursuant to Section 302 of the Sarbanes-Oxley Act
    of 2002.
|           
|31(b)       |  | Certification pursuant to Section 302 of the Sarbanes-Oxley Act
    of 2002.
|           
|32          |  | Certification pursuant to Section 906 of the Sarbanes-Oxley Act
    of 2002.